Figure 3
From: Biogenically induced bedded chert formation in the alkaline palaeo-lake of the Green River Formation
Successive photomicrographs and XRF images of a bedded chert sample. (a) Optical and (b) fluorescent photomicrograph. (c,d) XRF images. (e–g) Detailed fluorescence photographs of the areas indicated by white squares in (b). Scale bars in (a–d) and (e–g) are 1 cm and 500 μm, respectively.
